Abstract : This paper discusses a tension control system using an AC frequency converter as the actuator and a pressure sensor as the tension detection element. Addressing the poor adaptability of conventional PID control, an adaptive algorithm is combined with PID in the system design, achieving good control results in practice. Keywords: Tension control; AC speed regulation system; Adaptive PID; Output filtering; Asynchronous motor 0 Introduction Tension control is widely used in food and pharmaceutical packaging machinery such as printing presses, slitting machines, and laminating machines for tension control of materials such as films or paper. The key is maintaining constant tension during the winding process. In recent years, the use of AC frequency converter speed regulation systems to construct tension control systems has become mainstream. Motor-driven systems offer advantages such as good control performance, energy feedback, reduced power consumption, and the ability to reverse wind. 1 System Principle Figure 1 shows the typical structure of a tension control system. This system uses an AC frequency converter speed regulation system for both winding and unwinding. The system speed is adjusted by the main traction motor, which automatically adjusts its speed according to the roll diameter to maintain a constant tension in the roll material. This system uses an 80C196KC microcontroller as the core control component, sending the output of the pressure sensor to the controller. The regulator outputs the speed command of the frequency converter, forming a closed-loop system. The control block diagram is shown in Figure 2. [b]2 Algorithm Analysis 2.1 Frequency Converter Speed ​​Characteristics[/b] When the tension remains constant, the linear velocity of the machine is equal to the linear velocity of the main traction. The relationship between linear velocity and angular velocity is... [b][align=center]For details, please click: Research and Implementation of a Novel Tension Control System[/align][/b]